Problem P. 4101. (October 2008)
P. 4101. Several batteries, all having the same electromotive forces and the same internal resistances, were connected first in parallel and then in series and a resistor of resistance 129 was connected into the circuit. It was found that in case of the series connection the terminal voltage across each battery is 10% less than in case of the parallel connection. How many batteries were used?
Deadline expired on 11 November 2008.
|71 students sent a solution.|
|4 points:||52 students.|
|3 points:||3 students.|
|2 points:||5 students.|
|1 point:||11 students.|